Dragons international Shaun Timmins has been ruled out of the Anzac Day clash with the Roosters tomorrow while Mark Gasnier will undergo a fitness test five hours before kick-off.
Timmins was given a "slim chance" after a fitness test prior to training this morning but pulled up during the session after not feeling confident with the hamstring injury, while Gasnier will have an MRI on an injured calf muscle this afternoon.
Dragons coach Nathan Brown said he would not finalise his line-up until tomorrow.
Timmins, who has had two games back after a seven-month lay-off following knee surgery, said he was disappointed but would definitely be fine for the next Dragons match against the Sharks at Jubilee Oval on Sunday week.
"If it had of been a grand final I would have played, but I didn't want to risk it tomorrow; it didn't feel 100 per cent right," Timmins said.
Timmins, who has had five knee operations, said he had never injured his hamstring before. He strained it in the final 15 minutes of the match against the Bulldogs last Saturday
Gasnier said he injured his calf muscle during sprints at training yesterday but he is hopeful the MRI today will reveal a cork rather than a tear.
"If it's a cork I'll be right," he said. "I'll be doing everything I can to get on the field."